I'm trying to re-route by testing Tepigs with Lonely (+ Attack, - Defense) and Naughty (+ Attack, - Special Defense) Natures. However, I'm unsure about trainer Pokémon stats.

Can anyone tell me what stats trainer Pokémon have? Is there a general rule (gym leaders have 31 IV in everything etc.) or is it different for each trainer? Thanks

You can use this lua script by MKDasher with any gen 4/5 game on emulator: https://www.dropbox.com/s/qx2fo1zc44p1jr7/Pokemon%20Gen%204-5%20Lua%20script.rar

Press 1 to change game mode, 0 to toggle between top and bottom screen, 3/4 to change mode (party, enemy etc.), 7/8 to change party slot.

Thank you!